D defs.my
Entry 1 sense Webster, 1913

Shamrock

/shăm'-räkˌ/ · Sham·rock · IPA /ˈʃæm.ɹɑk/
01 n. A trifoliate plant used as a national emblem by the Irish. The legend is that St. Patrick once plucked a leaf of it for use in illustrating…
  1. 1.
    A trifoliate plant used as a national emblem by the Irish. The legend is that St. Patrick once plucked a leaf of it for use in illustrating the doctrine of the trinity.(Bot.)